GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Components of Amortizing Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 180,975	$ 123,941
Accumulated Amortization	(106,237)	(98,275)
Acquired and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	70,201	52,825
Accumulated Amortization	(50,997)	(48,063)
Customer relationships, trade names and noncompete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	110,774	71,116
Accumulated Amortization	$ (55,240)	$ (50,212)